Toward an understanding of the function of Chlamydiales in plastid endosymbiosis

Ball, Steven; Colleoni, Christophe; Kadouche, Derifa; Ducatez, Mathieu; Arias, Maria-Cecilia; Tirtiaux, Catherine

doi:10.1016/j.bbabio.2015.02.007

Cited by 13 publications

(13 citation statements)

References 44 publications

(90 reference statements)

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“…These findings led to the suggestion that cyanobacterial and chlamydial endosymbionts coexisted in an early eukaryotic host cell, and that this tripartite relationship was responsible for the transformation of cyanobacterial endosymbionts into modern-day plastids 30,67,69,70 . Although it has been argued that these chlamydiae-related genes could have resulted from phylogenetic artefacts or could have existed in the cyanobacterial progenitor of plastids [71][72][73] , some of these genes are only adaptive in parasitic or heterotrophic bacteria and are not found in extant cyanobacteria, suggesting that chlamydial involvement in plastid establishment is plausible 30,67,68,74 . Non-cyanobacterial prokaryotes other than chlamydiae also contributed genes for plastid genesis and functionality 69,[75][76][77] .…”

Section: Hgt In Eukaryotic Evolutionmentioning

confidence: 98%

Horizontal gene transfer: building the web of life

2015

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Horizontal gene transfer (HGT) is the sharing of genetic material between organisms that are not in a parent-offspring relationship. HGT is a widely recognized mechanism for adaptation in bacteria and archaea. Microbial antibiotic resistance and pathogenicity are often associated with HGT, but the scope of HGT extends far beyond disease-causing organisms. In this Review, we describe how HGT has shaped the web of life using examples of HGT among prokaryotes, between prokaryotes and eukaryotes, and even between multicellular eukaryotes. We discuss replacement and additive HGT, the proposed mechanisms of HGT, selective forces that influence HGT, and the evolutionary impact of HGT on ancestral populations and existing populations such as the human microbiome.

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Section: Hgt In Eukaryotic Evolutionmentioning

confidence: 98%

Horizontal gene transfer: building the web of life

2015

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“…Another possibility is nitrogen fixation, an idea not without merit in light of gene content similarities between gene-rich heterocyst-forming cyanobacteria and photosynthetic eukaryotes [72]. The possible existence of a third player in the primary endosymbiotic origin of plastids is actively being debated, more specifically a (no longer present) Chlamydia-like pathogen proposed to have been impacting glycogen metabolism in the eukaryotic host at around the time the cyanobacterium came on the scene (see [92][93][94] and references therein for discussion). Whatever the reason(s), endosymbiotic gene transfer (EGT), together with the evolution of the TIC-TOC translocon, led to the establishment of the primary plastid and the very first autotrophic eukaryote.…”

Section: Eukaryotic Photosynthesis: Origin and Spreadmentioning

confidence: 98%

Endosymbiosis and Eukaryotic Cell Evolution

2015

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Understanding the evolution of eukaryotic cellular complexity is one of the grand challenges of modern biology. It has now been firmly established that mitochondria and plastids, the classical membrane-bound organelles of eukaryotic cells, evolved from bacteria by endosymbiosis. In the case of mitochondria, evidence points very clearly to an endosymbiont of α-proteobacterial ancestry. The precise nature of the host cell that partnered with this endosymbiont is, however, very much an open question. And while the host for the cyanobacterial progenitor of the plastid was undoubtedly a fully-fledged eukaryote, how - and how often - plastids moved from one eukaryote to another during algal diversification is vigorously debated. In this article I frame modern views on endosymbiotic theory in a historical context, highlighting the transformative role DNA sequencing played in solving early problems in eukaryotic cell evolution, and posing key unanswered questions emerging from the age of comparative genomics.

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“…In their ‘ ménage à trois ’ hypothesis, Ball et al . () even hypothesised that this ancestor contained a chlamydial endosymbiont, which would have provided key genes in establishing the primary plastid; the existence of such an endosymbiont is controversial and hotly debated (discussed in Deschamps, ; Zimorski et al., ; Ball et al., ; Domman et al., ). It is more likely that Chlamydiae engulfed as food or present as intracellular pathogens represented the source of these genes.…”

Section: Critical Evaluation Of the Classical Paradigmsmentioning

confidence: 99%

Did some red alga‐derived plastids evolve via kleptoplastidy? A hypothesis

Bodył

2017

Biological Reviews

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The evolution of plastids has a complex and still unresolved history. These organelles originated from a cyanobacterium via primary endosymbiosis, resulting in three eukaryotic lineages: glaucophytes, red algae, and green plants. The red and green algal plastids then spread via eukaryote-eukaryote endosymbioses, known as secondary and tertiary symbioses, to numerous heterotrophic protist lineages. The number of these horizontal plastid transfers, especially in the case of red alga-derived plastids, remains controversial. Some authors argue that the number of plastid origins should be minimal due to perceived difficulties in the transformation of a eukaryotic algal endosymbiont into a multimembrane plastid, but increasingly the available data contradict this argument. I suggest that obstacles in solving this dilemma result from the acceptance of a single evolutionary scenario for the endosymbiont-to-plastid transformation formulated by Cavalier-Smith & Lee (1985). Herein I discuss data that challenge this evolutionary scenario. Moreover, I propose a new model for the origin of multimembrane plastids belonging to the red lineage and apply it to the dinoflagellate peridinin plastid. The new model has several general and practical implications, such as the requirement for a new definition of cell organelles and in the construction of chimeric organisms.

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Toward an understanding of the function of Chlamydiales in plastid endosymbiosis

Cited by 13 publications

References 44 publications

Horizontal gene transfer: building the web of life

Horizontal gene transfer: building the web of life

Endosymbiosis and Eukaryotic Cell Evolution

Did some red alga‐derived plastids evolve via kleptoplastidy? A hypothesis

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